Java 将集合传递到JPA存储库错误

我有3个类要通过JPA存储库进行交互：

目标-用户目标字典。与“单元”类的连接为多（目标）对一（单元）。因此，每个目标都可以与一个单元相关联

角色-拥有系统中的用户权限。与单元类的连接方式与目标相同。因此，每个角色也只能有一个单元

单位持有细分。被上面两个类用作字典 目标实体由goalrepository和goalservicepimpl支持，这是我的CRUD主界面

问题：我想将角色对象的集合传递给存储库（GoalServiceImpl），以获得一组“目标”，其单位与角色集相同。所以我可以通过传递一个角色参数来过滤目标列表

我把这个加到我的积木上

Iterable getGoalsByUnits（列表单位）
并得到一个错误：

 “Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract java.lang.Iterable com.platform.repository.GoalRepository.getGoalsByUnits(java.util.Set)! No property units found for type Goal! Did you mean 'unit'?”

我做错了什么？Mybe是因为每个目标对象只有一个单位？
解决我的任务的最好方法是什么

目标类

public class Goal {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   @Column(name = "ID", nullable = false)
   private Long id;

   @Column(name = "DESCR", length = 255, nullable = false)
   public String descr;

   @ManyToOne
   @JoinColumn (name="UNIT_ID", nullable = false)
   public Unit unit; //UNIT IS HERE!

   @Column(name = "VL")
   private float vl;


@Entity
@Table(name="UNITS", schema="MAPP")
public class Unit {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", nullable = false)
    private Long id;

    @Column(name = "UNITNAME")
    private String unitname;

    @OneToMany(mappedBy = "unit")
    Set<Role> role;


@Entity
@Table(name="ROLES", schema="MAPP")
public class Role implements GrantedAuthority {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", nullable = false)
    private Long id;

    @Column(name = "ROLENAME")
    private String rolename;

    @Column(name = "FULLNAME")
    private String fullname;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "UNIT_ID")
    private Unit unit;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "PERMISSION_ID")
    private Permission permission;

单元类

public class Goal {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   @Column(name = "ID", nullable = false)
   private Long id;

   @Column(name = "DESCR", length = 255, nullable = false)
   public String descr;

   @ManyToOne
   @JoinColumn (name="UNIT_ID", nullable = false)
   public Unit unit; //UNIT IS HERE!

   @Column(name = "VL")
   private float vl;


@Entity
@Table(name="UNITS", schema="MAPP")
public class Unit {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", nullable = false)
    private Long id;

    @Column(name = "UNITNAME")
    private String unitname;

    @OneToMany(mappedBy = "unit")
    Set<Role> role;


@Entity
@Table(name="ROLES", schema="MAPP")
public class Role implements GrantedAuthority {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", nullable = false)
    private Long id;

    @Column(name = "ROLENAME")
    private String rolename;

    @Column(name = "FULLNAME")
    private String fullname;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "UNIT_ID")
    private Unit unit;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "PERMISSION_ID")
    private Permission permission;

目标存储库

public interface GoalRepository extends CrudRepository<Goal, Long> {

    Iterable<Goal> getGoalsByUnit (Unit unit);
    Iterable<Goal> getGoalsByUnits (List<Unit> unit);
}


public interface GoalRepository扩展了crudepository{
Iterable getGoalsByUnit（单位）；
Iterable getGoalsByUnits（列表单位）；
}

目标存储库界面

public class GoalServiceImpl implements GoalService {

public Iterable<Goal> getByRoles (Set<Role> roles) {
    List<Unit> units = new ArrayList<>();
    roles.forEach(e -> {
            units.add(e.getUnit());
    });
    return rep.getGoalsByUnits(units);
}

public类GoalServiceImpl实现GoalService{
公共Iterable getByRoles（设置角色）{
列表单位=新的ArrayList（）；
角色。forEach（e->{
units.add（e.getUnit（））；
});
返回代表getGoalsByUnits（单位）；
}
Sprint Data JPA为存储库提供了许多方法，帮助我们定义从DB获取数据的方式，而无需编写查询

在您的例子中，您想在

子句中使用

，但该子句不能用复数形式表示，因此您的方法需要命名为
getGoalsByUnitIn
您是否尝试过
getGoalsByUnitIn（列表单位）
？谢谢！它很有效。不客气，很高兴我可以帮助您。如果您愿意接受，我会发布答案。